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LiTFSI salt concentration effect to digest lithium polysulﬁdes for high-loading sulfur electrodes

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Journal of Energy Chemistry 2023年第3期78卷 574-581,I0015页

作者： Jin-Kwang Song Moonsoo kim Seongbae Park young-Jun kim SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2 详细信息

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2

关键词： Lithium-sulfur battery Electrolyte concentration Li2S deposition High-loading sulfur electrode

Tribological properties of multilayer tetrahedral amorphous carbon coatings deposited by filtered cathodic vacuum arc deposition

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Friction 2021年第5期9卷 1292-1302页

作者： young-Jun JANG Jae-Il kim Wooyoung LEE Jongkuk kim Department of Extreme Environmental Coatings Surface Technology DivisionKorea Institute of Materials Science(KIMS)Gyeongnam-do 51508Republic of Korea Department of Mechanical Science and Engineering Graduate School of EngineeringNagoya UniversityNagoya 464-8603Japan

Tetrahedral amorphous carbon(ta‐C)has emerged as an excellent coating material for improving the reliability of application components under high normal ***,we present the results of our investigations regarding the mechanical and tribological properties of a 2‐μm‐thick multilayer ta‐C coating on high‐speed steel *** composed of alternating soft and hard layers are fabricated using filtered a cathodic vacuum arc with alternating substrate bias voltages(0 and 100 V or 0 and 150 V).The thickness ratio is discovered to be 1:3 for the sp2‐rich and sp3‐rich *** results show that the hardness and elastic modulus of the multilayer ta‐C coatings increase with the sp3 content of the hard *** hardness reached approximately 37 GPa,whereas an improved toughness and a higher adhesion strength(>29 N)are *** friction performance(μ=0.07)of the multilayer coating is similar to that of the single layer ta‐C thick coating,but the wear rate(0.13×10^(–6) mm^(3)/(N∙m))improved under a high load of 30 *** further demonstrate the importance of the multilayer structure in suppressing crack propagation and increasing the resistance to plastic deformation(H3/E2)ratio.

关键词： tetrahedral amorphous carbon(ta‐C) filtered cathodic vacuum arc deposition multilayer coatings alternating substrate bias voltage wear resistance plastic deformation resistance

The Anti-Inflammatory Effect of Cheongseoikki-Tang Ethanol Extract on Allergic Reactions Mediated by Bone Marrow-Derived Mast Cells

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Chinese Journal of Integrative Medicine 2013年第5期19卷 380-386页

作者： Joon-Ho Keum Ok-Hwa Kang Sung-Bae kim Su-Hyun Mun Yun-Soo Seo Ma-Ryong kim Jung-rae Rho young-Seob Lee Chung-Berm Park young-Guk kim Yong-II kim sin-Hee Han Dong-Yeul Kwon College of Pharmacy and Wonkwang Oriental Medicines Research Institute Wonkwang UniversityJeonbuk(570-749)Republic of Korea Department of Oceanography Kunsan National UniversityKunsan(573-701)Republic of Korea National Institute of Horticultural & Herbal Science RDAEumsung(369-873)Republic of Korea

Objective： Cheongseoikki-tang （CIT, Korean）, also called Qingshu Yiqi decoction（清署益气汤）and Seisho-ekki-to （Japanese）, is well known as an effective traditional combination of herbs for treating cardiovascular diseases. This study was to research its effects on bone marrow-derived mast cell （BMMC）-mediated allergy and inflammation mechanisms. Methods： In this study, the biological effect of Cheongseoikki-tang ethanol extract （CITE） was evaluated, focusing on its effects on the production of allergic mediators by phorbol 12-myfistate 13-acetate （PMA） plus calcium ionophore A23187 （A23187）-stimulated BMMCs. These allergic mediators included intedeukin-6 （IL-6）, prostaglandin D2 （PGD2）, leukotfiene （34 （LTC4）, and β-hexosaminidase （13-hex）. Results： Our data revealed that CITE inhibited the production of IL-6, PGD2,/TC4, and 15-hex induced by PMA plus A23187 （P〈0.05）. Conclusion： These findings indicate that CITE has the potential for use in the treatment of allergy.

关键词： Cheongseoikki-tang ethanol extract bone marrow-derived mast cell allergy interleukin-6 prostaglandin D2 leukotriene C4

Effect of nanoclay on properties of porous PVdF membranes

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 141-147页

作者： Hae-young HWANG Deuk-Ju kim Hyung-Jun kim young-Taik HONG Sang-Yong NAM School of Materials Science and Engineering Engineering Research Institute i-Cube Center Gyeongsang National University Fuel Cell Research Center Korea Institute of Science and Technology Seoul 136-791 Korea Energy Material Research Center Korea Research Institute of Chemical Technology Daejeon 305-600 Korea

The main requirements for battery separators are high porosity which can serve pathways of lithium ion and space for gel electrolytes to impregnate in a membrane and mechanical strength to allow easy handling for battery assembly. Generally, it appears the trade-off relationship between the porosity and mechanical strength of the membrane. PVdF composite membranes containing nano-size clays were used to improve the mechanical strength of the membrane without affecting the membrane porosity. The composite membranes were prepared by phase inversion method controlling the membrane preparation conditions such as retention time. The resultant membranes show increased mechanical properties with similar membrane porosity around 80 % compared to the pristine PVdF membrane. Incorporation of nonoclay can be considered as an effective method to improve the mechanica! strength in porous membrane supports, especially in a separator.

关键词： Li-ion battery separator poly(vinylidene fluoride) nanocomposite

Effect of an extraction solvent on the antioxidant quality of Pinus densiflora needle extract

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Journal of Pharmaceutical Analysis 2019年第3期9卷 193-200页

作者： Thamizhiniyan Venkatesan young-Woong Choi young-Kyoon kim Department of Forest Products and Biotechnology College of Science and TechnologyKookmin University

Pinus densiflora needle extract (PDNE) is widely reported to have many pharmacological activities including antioxidant potential. However, the solvent system used for extraction greatly affects its antioxidant quality. Hence, in the present study, we investigated the effect of a different ratio (vol/vol) of ethanol to water (0-100%) in the extraction of PDNE with potent antioxidant capacity. The chemical assays, 2,2-diphenyl-1 picrylhydrazyl (DPPH) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), were conducted to assess the antioxidant potential of PDNE. Subsequently, the cytoprotective effect of PDNE was determined using tert-butyl hydroperoxide (TBHP)-challenged HepG2 cellular model. The needle extracts from 40% ethanol (PDNE-40) showed greater radical scavenging activity followed by 60%, 20%, 80%, 0% and 100% ethanol extracts. EC50 value of the most active extract, PDNE-40, was 8.56 ± 0.51 μg/mL, relative to 1.34 ± 0.28 μg/mL of the standard trolox (for ABTS radical), and 75.96 ± 11.60 μg/mL, relative to 4.83 ± 0.26 μg/mL of the standard trolox (for DPPH radical). Either PDNE-20 or PDNE-40 pretreatment remarkably decreased the levels of reactive oxygen species (ROS), lipid peroxides and protein carbonyls in TBHP-challenged HepG2 cells. In addition, both PDNE-20 and PDNE-40 significantly reversed the decreased ratio of reduced (GSH) to oxidized (GSSG) glutathione. Moreover, these two extracts showed a significant inhibitory effect on TBHP-induced nuclear damage and loss of cell viability. In summary, the inclusion of 40% ethanol in water for extraction of Pinus densiflora needle greatly increases the antioxidant quality of the extract.

关键词： Pinus densiflora needle extract Oxidative stress Cytoprotective Natural antioxidant

Anti-neuro-inflammatory effects of Nardostachys chinensis in lipopolysaccharide-and lipoteichoic acid-stimulated microglial cells

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Chinese Journal of Natural Medicines 2016年第5期14卷 343-353页

作者： Sun young Park young Hun kim Geuntae Park Bio-IT Fusion Technology Research Institute Pusan National University Department of Nanomaterials Engineering Pusan National University

Excessive microglial cell activation is related to the progression of chronic neuro-inflammatory disorders. Heme oxygenase-1(HO-1) expression mediated by the NFE2-related factor(Nrf-2) pathway is a key regulator of neuro-inflammation. Nardostachys chinensis is used as an anti-malarial, anti-nociceptive, and neurotrophic treatment in traditional Asian medicines. In the present study, we examined the effects of an ethyl acetate extract of N. chinensis(EN) on the anti-neuro-inflammatory effects mediated by HO-1 up-regulation in Salmonella lipopolysaccharide(LPS)- or Staphylococcus aureus lipoteichoic acid(LTA)-stimulated BV2 microglial cells. Our results indicated that EN suppressed pro-inflammatory cytokine production and induced HO-1 transcription and translation through Nrf-2/antioxidant response element(ARE) signaling. EN markedly inhibited LPS- and LTA-induced activation of nuclear factor-kappa B(NF-?B) as well as phosphorylation of mitogen-activated protein kinases(MAPKs) and signal transducer and activator of transcription(STAT). Furthermore, EN protected hippocampal HT22 cells from indirect neuronal toxicity mediated by LPS- and LTA-treated microglial cells. These results suggested that EN impairs LPS- and LTA-induced neuro-inflammatory responses in microglial cells and confers protection against indirect neuronal damage to HT22 cells. In conclusion, our findings indicate that EN could be used as a natural anti-neuro-inflammatory and neuroprotective agent.

关键词： Nardostachys chinensis Anti-inflammation Lipopolysaccharide Lipoteichoic acid Heme oxygenase-1

Protective Effect of Brassica napus *** against Inflammation Response in RAW 264.7 Cells

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Chinese Journal of Integrative Medicine 2021年第4期27卷 273-279页

作者： Su-Hyeon Cho Song rae kim Myeong Seon Jeong Miri Choi SeonJu Park Kil-Nam kim Chuncheon Center Korea Basic Science InstituteChuncheon(24341)Republic of Korea

Objective:To demonstrate the anti-inflammatory activity of Brassica napus ***(BNH)in lipopolysaccharide(LPS)-stimulated RAW 264.7 ***:Composition analysis of BNH was conducted via gas chromatography-mass spectrometry after BNH were *** nitric oxide(NO)production was measured using the Griess *** E2(PGE2)production was evaluated with enzyme-linked immunosorbent *** effects of BNH on LPS-induced pro-inflammatory enzymes including inducible nitric oxide synthase(iNOS)and cyclooxygenase-2(COX-2)were evaluated using Western blot ***,phosphorylation of nuclear factor-kappa B(N F-k B)and nuclear translocation of N F-k B p65 were evaluated with Western blot analysis and immunofluorescence staining,***:Compared with LPS-stimulated cells,BNH markedly decreased the generation of NO and PGE_(2)in LPS-stimulated RAW 264.7 cells(P<0.01 or P<0.05).Moreover,BNH inhibited protein levels of iNOS and COX-2(P<0.01).Phosphorylation of NF-k B and nuclear translocation of NF-k B p65 was significantly inhibited by BNH(P<0.01 or P<0.05).Conclusion:The anti-inflammatory activities of BNH were mediated via blockage of the N F-k B signaling pathways in LPS-stimulated RAW 264.7 cells.

关键词： Brassica napus L. inflammation lipopolysaccharide RAW 264.7 cells hydrosols

Three-dimensional endoanal ultrasonographic assessment of an anal fistula with and without H_2O_2 enhancement

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World Journal of Gastroenterology 2009年第38期15卷 4810-4815页

作者： Yung kim young Jin Park Department of Surgery Dongguk University Ilsan HospitalDongguk University School of Medicine

AIM： To evaluate the effectiveness of three-dimensional endoanal ultrasound （3D-EAUS） in the assessment of anal fistulae with and without H202 enhancement. METHODS： Sixty-one patients （37 males, aged 17-74 years） with anal fistulae, which were not simple low types, were evaluated by physical examination and 3D-EAUS with and without enhancement. Fistula classification was determined with each modality and compared to operative findings as the reference standard. RESULTS： The accuracy of 3D-EAUS was significantly higher than that of physical examination in detecting the primary tract （84.4% vs 68.7%, P = 0.037） and secondary extension （81.8% vs 62.1%, P = 0.01） and localizing the internal opening （84.2% vs 59.7%, P = 0.004）. A contrast study with H202 detected several more fistula components including two primary suprasphincteric fistula tracks and one supralevator secondary extension, which were not detected on non-contrast study. However, there was no significant difference in accuracy between 3D-EAUS and H202- enhanced 3D-EAUS with respect to classification of the primary tract （84.4% vs 89.1%, P = 0.435） or secondary extension （81.8% vs 86.4%, P = 0.435） or localization of the internal opening （84.2% vs 89.5%, P = 0.406）. CONCLUSION： 3D-EAUS was highly reliable in the diagnosis of an anal fistula. H2O2 enhancement was helpful at times and selective use in difficult cases may be economical and reliable.

关键词： Anal fistula Endoanal ultrasound H2O2enhancement

Effect of preoperative biliary drainage on surgical results after pancreaticoduodenectomy in patients with distal common bile duct cancer:Focused on the rate of decrease in serum bilirubin

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World Journal of Gastroenterology 2008年第7期14卷 1102-1107页

作者： Yun Mee Choi Eung-Ho Cho Keon-young Lee Seung-Ik Ahn Sun Keun Choi Sei Joong kim Yoon Seok Hur young Up Cho Kee-Chun Hong Seok-Hwan Shin Kyung rae kim Ze-Hong Woo Department of Surgery College of MedicineInha UniversityIncheonKorea

AIM: To examine if the rate of decrease in serum bilirubin after preoperative biliary drainagecan be used as a predicting factor for surgical complications and postoperative recovery after pancreaticoduodenectomy in patients with distal common bile duct ***: A retrospective study was performed in 49 consecutive patients who underwent pancrea-ticoduodenectomy for distal common bile duct cancer. Potential risk factors were compared between the complicated and uncomplicated groups. Also, the rates of decrease in serum bilirubin were compared pre- and postoperatively. RESULTS: Preoperative biliary drainage (PBD) was performed in 40 patients (81.6%). Postoperative morbidity and mortality rates were 46.9% (23/49) and 6.1% (3/49), respectively. The presence or absence of PBD was not different between the complicated and uncomplicated groups. In patients with PBD, neither the absolute level nor the rate of decrease in serum bilirubin was significantly different. Patients with rapid decrease preoperatively showed faster decrease during the first postoperative week (5.5 ± 4.4 μmol/L vs -1.7 ± 9.9 μmol/L, P = 0.004).CONCLUSION: PBD does not affect the surgical outcome of pancreaticoduodenectomy in patients with distal common bile duct cancer. There is a certain group of patients with a compromised hepatic excretory function, which is represented by the slow rate of decrease in serum bilirubin after PBD.

关键词： Distal bile duct cancer Drainage Bilirubin Rate